Oil and protest

Oil sector unionists protest with placards during a solemn session to mark the 60th anniversary of Petrobras, in Brasilia October 7, 2013. The unionists are demonstrating against the auction of the Libra oil area, Brazil's biggest-ever oil discovery, which is scheduled on October 21.

Oil sector unionists protest with placards during a solemn session to mark the 60th anniversary of Petrobras, in Brasilia October 7, 2013. The unionists are demonstrating against the auction of the Libra oil area, Brazil's biggest-ever oil discovery, which is scheduled on October 21. (UESLEI MARCELINO / REUTERS)

Oil sector unionists protest with placards during a solemn session to mark the 60th anniversary of Petrobras, in Brasilia October 7, 2013. The unionists are demonstrating against the auction of the Libra oil area, Brazil's biggest-ever oil discovery, which is scheduled on October 21.UESLEI MARCELINO / REUTERS